I've never used MicroSoft Sound Mapper but I just opened Audio-Vac1 and set the Driver to MME and then looked at both the input and output and see the "Microsoft Sound Mapper" option for both. Don't know why you wouldn't see it too. I'm using PowerSDR version 3.4.9.

In fact, most newbie questions and FAQs you will find at that the forum site. I would encourage you to kick back with your favorite beverage and peruse most of the "sticky" threads in the various sub-forums.

73,

Scott/w-u-2-o

P.S. sorry for the delay in answering, but I just returned from an 18 hour international itinerary followed by a good night's sleep.

So I read the tutorial, very good... What I don't understand is..... If I want to route Power SDR audio to the speakers in the pc , let's say...

Q Is it still necessary to configure an input device such as a microphone in order to get vac to work...?

Not at all. Just follow the example of the USB headset in the tutorial. If you have a physical sound device no virtual audio cable software is required. The requirement for VAC software comes about when you have software that can only interface with a physical sound device, which is nearly all software out there.

If everyone started adding a virtual device port on their software app's we wouldn't need VAC software anymore.

After going through the configuration,,, I find that there is no recording devices in the list under the SOUND configuration tab in Win 7... but there are speakers under the play back tab... When I go to powersdr I see no input devices under the input tab , but I do see Microsoft Mapper and Realtek audio speakers under the output tab. So it seem to me that the MME driver is functioning...??

As I mentioned I am just trying to route SDR audio to the speakers in the pc to start..

I did select the speakers and then I enable VAC button , but when I do that Power SDR generates a fault Invalid number of channels ...Try connecting a microphone to your computers sound card.. I then click Ok and get Invalid Stream pointer...

You must assign a device for both the input and output or PowerSDR will be unhappy. This is an unfortunately limitation (I'd call it a bug, really) of the software.

Re-reading your posts, I see that you have no input devices available. You must create one to assign, even if you are not going to use it. It seems unlikely that your PC does not have a microphone input. If it does, and if that microphone input does not appear in the Windows Sound Control Panel, then you probably need to update your sound interface drivers such that it does. Then you can assign it and the speakers in the VAC setup tab in PowerSDR.